There’s… kind of a lot of variance here, so it’s hard to nail down precisely. What are your current core-options in ParaLLEl?
(I don’t touch mupen, personally.)
Rogue Squadron though, right out of the gate… “Good luck” lol Factor 5 games are notoriously hard to emulate. Those devs were really something else. Still, if you set the RSP plugin to ‘cxd4’ and the GFX plugin to ‘angrylion’ it should boot up. It’s going to be pretty slow though. You honestly might be better off snagging the Gog.com PC version of the game if you’ve got the itch.
Aside from that I keep the default options as RSP = ‘hle’ and GFX = glide64. I have never played the N64 ver of Hang-Time (had it on genesis though lol) I know I’ve played around with conker in the last few months… but I’m doing so much Xbox stuff as well that I’m not sure if any of that was the N64 version…
1080 however, I never noticed any issue playing that one. If it’s being stuttery it could be an actual “video” setting, rather than a core setting. If worse comes to worst you can always enable “Threaded Video” in the video options… this brings a lot of speed - but I believe it deactivates other features. Not 100% on it - I only have to turn it on for DS stuff.